Earlier this month, Dame Barbara, 82, and Mr Mitchell called on Prime Minister Boris Johnson to solve the dementia care crisis as they were named ambassadors of charity Alzheimer’s Society.

The couple released an open letter calling on Mr Johnson to sort out dementia care and encourage the public to sign it before it is delivered to 10 Downing Street in September.

Mr Mitchell, who married the actress in 2000, was joined by stars from EastEnders to run the London Marathon earlier this year for the Dementia Revolution, a partnership between the Alzheimer’s Society and Alzheimer’s Research UK.